Has the car been jump started recently? Your post suggests otherwise, but that's a common cause for killing the battery ECU.
Or the car has decided it doesn't like the battery anymore. There's a post somewhere here or on the ross-tech wiki on how to tell the D3 it has a new battery and see how that behaves.
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2010 Jag XF 3.0D Portfolio S
I know.. I know..
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